Honeywell MK VI, MK VIII 6.6.25 Steep Approach Discrete #2, 6.6.26 Timed Audio Inhibit Discrete, 6.6.27 GPWS Inhibit Discrete, 6.6.28 Localizer Validity Discrete #1

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
Proprietary notice on title page applies
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-150 REV: SHEET 302
6.6.25 Steep Approach Discrete #2
Activates steep approach biasing if Steep Approach Enabled is true (see Category 7, Section 5.3.7).
Alt. Action Type:Supplied by an alternate action (latching) and self indicating cockpit switch .
Momentary Type: Supplied by a momentary (non-latching) switch with switch lamp driven by EGPWS Steep Approach
Discrete output.
Signal Status: Steep Approach Selected or not Selected
Fault monitoring: None if Steep Approach Enabled is false. EGPWS Self-Test is inhibited if Steep Approach Enabled is
true and Steep Approach Discrete #2 is “Selected” on the ground. For momentary switch inputs,
activation of this switch input for more than 15 seconds will result in the “Steep Approach Invalid”
fault which will cause a GPWS INOP indication.
Level 6 Audio readout
Steep Approach Discrete #2 Selected =>
Not Selected =>
“Steep Approach Selected”
“Steep Approach Not Selected”
6.6.26 Timed Audio Inhibit Discrete
Type: Supplied by a momentary action (internally latching) and indicating cockpit switch for inhibit of audio functions.
Signal Status: Audio Inhibit or not Inhibit
Fault monitoring: The Audio Inhibit function does not inhibit Self Test, therefore, “Timed Audio Inhibited Fault” will be
enunciated during cockpit Level 2 Self Test.
Level 6 Audio readout
Timed Audio Inhibit Discrete Selected =>
Not Selected =>
“Timed Audio Inhibit”
“Timed Audio Not Inhibit”
6.6.27 GPWS Inhibit Discrete
This discrete inhibits all audio and visual except for Windshear, Terrain Awareness and TCF.
Type: Supplied by an alternate action (latching) and self indicating cockpit switch.
Signal Status: GPWS enabled or disabled
Fault monitoring: Activation of this input for more than 5 seconds will result in the ‘GPWS Inhibit’ fault which will
cause a GPWS INOP indication.
Level 6 Audio readout
GPWS Inhibit Discrete Selected =>
Not Selected =>
“GPWS Inhibit”
“GPWS Not Inhibit”
6.6.28 Localizer Validity Discrete #1
A Localizer Validity discrete may be used by the EGPWS for localizer input from an ARINC 547 Nav Receiver.
Type: Validity from ARINC 547 Nav Receiver
Signal Status: Valid or Invalid
Level 6 Audio readout
Localizer Validity Discrete #1 Valid =>
Invalid =>
“Localizer 1 Valid”
“Localizer 1 Invalid”